The following example shows the use of Regular Expresssions in C#.This program has basic validation scripts for validation easily useable in all programs.

/*
<HowToCompile>
csc /r:System.Text.RegularExpressions.dll,System.dll Validation.cs
</HowToComplie>
*/

using System.Text.RegularExpressions;
using System;

class Validation
{
public static void Main()
{
String strToTest;
Validation objValidate=new Validation();

Console.Write("Enter a String to Test for Alphabets:");
strToTest=Console.ReadLine();
if(objValidate.IsAlpha(strToTest))
{
Console.WriteLine("{0} is Valid Alpha String",strToTest);
}
else
{
Console.WriteLine("{0} is not a Valid Alpha String",strToTest);
}
}

// Function to test for Positive Integers.

public bool IsNaturalNumber(String strNumber)
{
Regex objNotNaturalPattern=new Regex("[^0-9]");
Regex objNaturalPattern=new Regex("0*[1-9][0-9]*");

return !objNotNaturalPattern.IsMatch(strNumber) &&
objNaturalPattern.IsMatch(strNumber);
}

// Function to test for Positive Integers with zero inclusive

public bool IsWholeNumber(String strNumber)
{
Regex objNotWholePattern=new Regex("[^0-9]");

return !objNotWholePattern.IsMatch(strNumber);
}

// Function to Test for Integers both Positive & Negative

public bool IsInteger(String strNumber)
{
Regex objNotIntPattern=new Regex("[^0-9-]");
Regex objIn

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